Macro looked at the gloomy water between them and the Druids’ island. There was no shore on the near ground, only a tangle of reeds and low trees rising above dark peaty mud. If they were caught wading through that lot there would be no chance of escape. He wondered at the Iceni warrior’s confidence that he could find his trail again in the dark. Yet Prasutagus had sworn by all his most sacred gods that he would lead them safely across to the island. But they must trust him, and follow him precisely.

‘We’ll go as soon as it’s dark enough,’ decided Macro. ‘The three of us. The woman stays.’

‘What?’ Boudica turned angrily towards him.

‘Hush!’ Macro nodded towards the island. ‘If we find the general’s family but don’t make it back, someone has to ride to the legion and let them know.’

‘And how precisely would you let me know?’

Macro smiled. ‘You don’t make centurion unless you can be heard at a distance.’

‘He’s right enough there,’ muttered Cato.

‘But why me? Why not leave Cato here. You’ll need me to translate.’

‘There won’t be much need for talking. Besides, Prasutagus and me are coming to an understanding of sorts. He can speak a few words now. A few words of a proper language, that is. Ain’t that right?’

Prasutagus nodded his shaggy head.

‘So, keep your ears pricked. If I call your name, or if any of us does, that’s the signal. We’ve found them. You don’t wait a moment. You get back to the horses, take one and ride like the wind. Report everything to Vespasian.’

‘What about you?’ asked Boudica.

‘If you hear any of us shout, chances are those will be our last words.’ Macro raised a hand and gently held her shoulder. ‘Are you clear about all that?’

‘Yes.’

‘Right then, this is as good a place as any to wait. Stay here. As soon as it’s dark enough, we’ll strip down to tunics and swords and follow Prasutagus over to the island.’

‘And just for a change,’ said Macro softly, ‘we’re up to our balls in freezing water.’

The smell of decay that rose from the disturbed waters about their legs was so pungent that Cato thought he might throw up. This was worse than almost anything he had ever smelt before. Even worse than the tannery outside the walls of Rome he had once visited with his father. The hardy tanners, long immune to the stench, had laughed themselves silly at the sight of the small boy in the neat livery of the imperial palace heaving his guts up into a tub of sheep entrails.